Hi Ini888,

It helps to know your rights and to be prepared when discussing these issues with your employer.

Does your employer have 15 or more employees? If so, it must comply with the Americans with Disabilities Act, Title I. The employer has a duty to make reasonable accommodations that do not create an undue hardship. An employee with a disability must be able to perform the essential duties of their job, with or without reasonable accommodations. It's always best when the employee knows and requests the accommodations that are needed. In your case, a graduated return to work might be appropriate, starting with less hours and working up eventually to your regular week. Also, you may be wise to discuss Return to Work with your doctor to see what they suggest.
If your employer has less than 15 employees, your state may have a Civil Rights Commission with disability discrimination laws similar to the ADA and applicable to your employer.

Here are a couple of resources:
The Job Accommodation Research, http://www.jan.org
JAN has counselors that you can call and speak to,
and here's a fact sheet:
https://adata.org/factsheet/reasonable-accommodations-workplace
I hope this helps.